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                Seq                </h1>
                <p>时间限制：20s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：245MB</p>			</div>
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                                <h3>题目描述</h3><p><p><span style="font-size: medium;">给点一个N个点，N-1条边的无向连通图<br />
每个点都有黑白的属性，如果树上一条路径上黑色点个数和白色点<br />
个数一样多。称其为GOOD路径。易知两点间只有一条路径，那么给<br />
定点A和点B就能确定一条路径了。<br />
现给点集S，定义其GOOD值为以点集中的点两两确定的路径中GOOD路径<br />
的个数。<br />
现再给点一个序列，在一个方案中，某人可以选定其中一个连续子序列<br />
作为他的点集，另一个人取走剩下的点。现某人想知道他的GOOD值比另一个人<br />
的GOOD值大的方案数。<br />
<br />
</span></p></p><hr/><h3>输入格式</h3><p><p><span style="font-size: medium;"><br />
</span><span style="font-size: medium;"><br />
<br />
第一个一个整数N，表示点的个数<br />
接下来一行N个数，描述每个点的着色，黑色为1，白色为0<br />
接下来N-1行，每行两个数a,b,表示一条连接a,b的边.<br />
再接下来N个数，为1到N的排列，描述给定的序列。</span></p></p><hr/><h3>输出格式</h3><p><p><br />
<span style="font-size: medium;"><span style="font-size: medium;">输出如题<br />
</span><br />
</span></p></p><hr/><h3>样例输入</h3><pre>1
0
1



</pre><hr/><h3>样例输出</h3><pre>
0</pre><hr/><h3>提示</h3><p><p><br />
N&lt;=10^5</p></p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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